Question

Suppose C = 20y + 15 and y = 50x + 5. Which of the following is equivalent to C = 20y + 15, but written only in terms of x?

a.)

C = 1000x + 100


b.) correct Answer

C = 1000x + 115


c.)

C = 100x + 135


d.)

C = 100x + 35

Answer 1

C = 1000x + 115 (Answer B)

Explanation:

We know that..

C = 20y + 15

y = 50x + 5

So put the Y value in the equation of C

C = 20 (50x + 5) + 15

C = 1000x + 100 +15

C = 1000x + 115